[PR 128] CMake: Fix error locating protobuf without Hunter

When protobuf is provided by other build systems, it may require discovery
using a Findprotobuf.cmake module instead of the config file. By removing
'CONFIG', we allow CMake to choose.

Error was:

| CMake Error at cmake/dependencies.cmake:18 (find_package):
|   Could not find a package configuration file provided by "Protobuf" with any
|   of the following names:
|
|     ProtobufConfig.cmake
|     protobuf-config.cmake

Author: eigendude

cmake/dependencies.cmake

@@ -20,7 +20,7 @@ find_package(OpenSSL REQUIRED)
 
 # https://developers.google.com/protocol-buffers/
 hunter_add_package(Protobuf)
-find_package(Protobuf CONFIG REQUIRED)
+find_package(Protobuf REQUIRED)
 
 # https://docs.hunter.sh/en/latest/packages/pkg/spdlog.html
  hunter_add_package(spdlog)